What contribution could I give to the priest?

Hint 1 of 6:

Have you visited the temple sometime in the future?

Hint 2 of 6:

There's a big, shiny emerald in the statue's belly.

Hint 3 of 6:

Have you asked the priest about it?

Hint 4 of 6:

The emerald was used to found the temple.

Hint 5 of 6:

So an emerald would make a pretty good gift, wouldn't it?